In a method and a device for determining and indicating a residual capacity of a battery, a charging amount is measured in a charging mode in which a charger having a sensor for detecting a fully charged state is connected to the battery. If the charging amount in the charging mode is more than a trickle...http://www.google.ca/patents/US5341084?utm_source=gb-gplus-sharePatent US5341084 - Method and device for determining and indicating a residual capacity of a battery
